Twin Tiers

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This map indicates the area known as the Twin Tiers. Counties in DARK GREEN are almost always considered part of the Southern Tier. Counties in DARK RED indicate the Northern Tier. Counties in PINK are those in Pennsylvania that consider themselves part of the Twin Tiers but not the Northern Tier, and counties in LIGHT GREEN are those that sometimes consider themselves Southern Tier Counties.
This map indicates the area known as the Twin Tiers. Counties in DARK GREEN are almost always considered part of the Southern Tier. Counties in DARK RED indicate the Northern Tier. Counties in PINK are those in Pennsylvania that consider themselves part of the Twin Tiers but not the Northern Tier, and counties in LIGHT GREEN are those that sometimes consider themselves Southern Tier Counties.

The Twin Tiers is a geographical term that refers to the collective counties that lie on the New York-Pennsylvania border adjacent to the 42nd parallel north.

Separately, the two halves of the Twin Tiers region are known as the Southern Tier region in the state of New York and the Northern Tier region in the Commonwealth of Pennsylvania.

The region is predominantly rural and contains many small towns. It is usually defined as including the following counties:

Northern Tier Southern Tier

In an oddity, McKean, Potter and (less often) Cameron Counties refer to themselves as part of the Twin Tiers but almost never consider themselves part of the Northern Tier.

Erie County, Pennsylvania and Warren County, Pennsylvania are almost never considered part of the Twin Tiers.

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